Book cover art inaccuracy

[Nuytsia]

Yes I've seen some absolute shockers, although the ones you mention sound particularly bad! I can't think of one where I definitely knew the character was incorrectly shown, it is more usually that I just can't even work out which character it is supposed to be!
I think I have probably seen quite a few books with dragons breathing fire while flying on the cover....

And I must admit I probably wouldn't read a book if it had a guy in a loincloth or a girl in a chainmail bikini on the front!